Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 969 · 40 questions

Engineer's tip (Find the topic, use the idea): Find the topic: force, friction, machine, lever class, balance, pulley or work. Use that lesson’s rule — what is in the middle, load × distance = effort × distance, effort = load ÷ ropes, work = force × distance. Write the calculation before you answer.

1. 1.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 30 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 3 (b) class 1 (c) class 2
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
4. 4.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
5. 5.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) yes, always (d) no, work stays the same
6. 6.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
7. 7.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) use a smaller force (c) switch off gravity (d) stop all friction
8. 8.🪝 A winch has a wheel of radius 2 cm and an axle of radius 1 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
9. 9.💪 Which force is at work: a thrown ball comes down? (a) muscular force (b) gravity (c) magnetic force (d) friction
10. 10.🏋️ A 6 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
11. 11.🏋️ Pushing a crate 7 m took 140 J of work. What force was used, in newtons?
12. 12.Which of these is an inclined plane? (a) a wood screw (b) a bottle cap (c) a nut and bolt (d) a truck loading ramp
13. 13.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
14. 14.⚙️ A screw is really … (a) a bent lever (b) a tiny pulley (c) a kind of wheel (d) a ramp wrapped round
15. 15.True or false: a crowbar is a lever. (a) False (b) True
16. 16.💪 In which unit do we measure force? (a) metre (m) (b) second (s) (c) newton (N) (d) litre (L)
17. 17.True or false: pulling a cart is a push. (a) True (b) False
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
19. 19.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 320 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.True or false: a smooth steel slide gives more friction. (a) True (b) False
21. 21.⚖️ A seesaw balances. Meena (760 N) sits 1 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) True (b) False
23. 23.True or false: your forearm is a class 2 lever (load in the middle). (a) True (b) False
24. 24.True or false: a wet tiled floor gives less friction. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) a playground slide (b) a door stopper (c) a chisel (d) a knife edge
26. 26.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 1 (c) class 3
27. 27.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
28. 28.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) powder on a carrom board (d) a box pushed on carpet
29. 29.🪝 A well winch has a handle (wheel) of radius 30 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
30. 30.🪝 A pulley system lifts an 80 N load with an effort of 20 N. What is its mechanical advantage (MA)?
31. 31.💪 Which force pulls everything towards the Earth? (a) gravity (b) magnetism (c) wind (d) friction
32. 32.💪 A box weighs 280 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
33. 33.True or false: a nutcracker is a class 1 lever (fulcrum in the middle). (a) False (b) True
34. 34.⚖️ A seesaw balances. Ravi (280 N) sits ? m from the pivot on one side; Meena (560 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
35. 35.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 100 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
37. 37.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
38. 38.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a box pushed on carpet (d) sand on a slippery path
39. 39.⚖️ A lever bar balances. The load is 30 N at 20 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
40. 40.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)

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